This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A366627 #18 Apr 15 2025 22:33:22 %S A366627 1,1,1,2,1,3,3,3,2,3,3,2,2,4,3,5,3,3,6,3,3,5,4,3,4,4,4,5,5,4,9,2,3,6, %T A366627 3,10,5,4,3,9,5,4,7,2,3,7,5,2,7,5,6,8,4,5,10,7,6,7,3,2,6,3,2,9,3,8,11, %U A366627 5,5,6,7,4,5,6,4,10,5,5,10,6,6,8,4,5,8 %N A366627 Number of distinct prime divisors of 6^n + 1. %H A366627 Max Alekseyev, <a href="/A366627/b366627.txt">Table of n, a(n) for n = 0..430</a> %F A366627 a(n) = omega(6^n+1) = A001221(A062394(n)). %t A366627 PrimeNu[6^Range[0,84] + 1] (* _Paul F. Marrero Romero_, Nov 11 2023 *) %o A366627 (PARI) for(n = 0, 100, print1(omega(6^n + 1), ", ")) %Y A366627 Cf. A062394, A001221, A057938, A366620, A366628, A366629, A366630. %Y A366627 Cf. A046799, A366580, A366605, A366615, A366636, A366655, A366664, A119704, A366686, A366712. %K A366627 nonn %O A366627 0,4 %A A366627 _Sean A. Irvine_, Oct 14 2023